Insulated Flexible Duct, Polyester, 180F

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• Brand Atco
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• Description Flexible Duct, For Nominal Duct Diameter 4 in, Wall Thickness 1.25 in, Maximum Temperature Rating 180 Degrees F, Minimum Temperature Rating -20 Degrees F, Insulation Value R 4.2, Color Gray, Overall Length 25 ft, Duct Material Fiberglass, Jacket Material Polyester, Fire Rating Flame Spread: 25 Max; Smoke Developed: 50 Max, Maximum Pressure Rating 6 in wc, Maximum Air Speed 5,000 fpm, Vapor Transmission 0.6 Percent